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<!--数据代理:通过一个对象代理对另一个对象中属性的操作（读/写）-->
<script>
    const obj1 = {
        x: 200
    };
    const obj2 = {
        y: 200
    };
    Object.defineProperty(obj2, 'x', {
        get() {
            return obj1.x;
        },
        set(value) {
            obj1.x = value;
        }
    });
</script>

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